Linux PowerPC port

src/aal/aal.h

@@ -19,6 +19,10 @@
 #  define PLATFORM_IS_ARM
 #endif
 
+#if defined(__powerpc__) || defined(__powerpc64__)
+#  define PLATFORM_IS_POWERPC
+#endif
+
 namespace snmalloc
 {
   /**
@@ -47,6 +51,7 @@ namespace snmalloc
   enum AalName : int
   {
     ARM,
+    PowerPC,
     X86,
     X86_SGX,
   };
@@ -140,6 +145,8 @@ namespace snmalloc
 #  include "aal_x86_sgx.h"
 #elif defined(PLATFORM_IS_ARM)
 #  include "aal_arm.h"
+#elif defined(PLATFORM_IS_POWERPC)
+#  include "aal_powerpc.h"
 #endif
 
 namespace snmalloc

src/aal/aal_powerpc.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#if defined(__powerpc64__)
+#  define SNMALLOC_VA_BITS_64
+#else
+#  define SNMALLOC_VA_BITS_32
+#endif
+
+namespace snmalloc
+{
+  /**
+   * ARM-specific architecture abstraction layer.
+   */
+  class AAL_PowerPC
+  {
+  public:
+    /**
+     * Bitmap of AalFeature flags
+     */
+    static constexpr uint64_t aal_features = IntegerPointers;
+
+    static constexpr enum AalName aal_name = PowerPC;
+
+    static constexpr size_t smallest_page_size = 0x1000;
+
+    /**
+     * On pipelined processors, notify the core that we are in a spin loop and
+     * that speculative execution past this point may not be a performance gain.
+     */
+    static inline void pause()
+    {
+      __asm__ volatile("or 27,27,27"); // "yield"
+    }
+  };
+
+  using AAL_Arch = AAL_PowerPC;
+} // namespace snmalloc

src/pal/pal_linux.h

@@ -25,7 +25,8 @@ namespace snmalloc
      */
     static constexpr uint64_t pal_features = PALPOSIX::pal_features;
 
-    static constexpr size_t page_size = 0x1000;
+    static constexpr size_t page_size =
+      Aal::aal_name == PowerPC ? 0x10000 : 0x1000;
 
     /**
      * OS specific function for zeroing memory.